Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Flagstaff, AZ

July 11, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 11, 2021, 4:46 PM MST for Yavapai County, Arizona. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2021, 4:46 PM MST (23:46 UTC)
Expired: Jul 11, 2021, 5:15 PM MST
In force: 29 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Yavapai County, AZ

The radar

The Las Vegas radar (KESX), 157 km from the middle of the area, began a volume at 23:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.8 hours before the alert went out and 134 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 197 J/kg
Mixed-layer CIN: -303 J/kg
Mixed-layer LCL: 2378 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

573 
WUUS55 KFGZ 112346
SVRFGZ
AZC025-120015-
/O.NEW.KFGZ.SV.W.0031.210711T2346Z-210712T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
446 PM MST Sun Jul 11 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Yavapai County in west central Arizona...

* Until 515 PM MST.

* At 444 PM MST, a severe thunderstorm was located near Diamond M 
  Ranch, or 42 miles east of Kingman, moving southwest at 5 mph. 
  This storm may impact portions of Interstate 40 near milepost 95

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Cross Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3537 11333 3527 11315 3495 11323 3500 11333
TIME...MOT...LOC 2344Z 049DEG 6KT 3526 11329 

HAIL...1.00IN
WIND...60MPH
 
$$

RR

2 follow-up statements

754 
WWUS55 KFGZ 120000
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
500 PM MST Sun Jul 11 2021

AZC025-120015-
/O.CON.KFGZ.SV.W.0031.000000T0000Z-210712T0015Z/
Yavapai-
500 PM MST Sun Jul 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST
FOR YAVAPAI COUNTY...

At 459 PM MST, a severe thunderstorm was located near Diamond M 
Ranch, or 40 miles east of Kingman, moving southwest at 5 mph. This 
storm is around Interstate 40 near milepost 95.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Cross Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Heavy rainfall is occurring with this storm, and may lead to flash 
flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3527 11332 3523 11320 3511 11324 3513 11333
      3525 11333
TIME...MOT...LOC 2359Z 049DEG 6KT 3524 11331 

HAIL...1.00IN
WIND...60MPH
 
$$

RR

773 
WWUS55 KFGZ 120006
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
506 PM MST Sun Jul 11 2021

AZC025-120015-
/O.EXP.KFGZ.SV.W.0031.000000T0000Z-210712T0015Z/
Yavapai-
506 PM MST Sun Jul 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
515 PM MST...
                
The storm which prompted the warning near Interstate 40 at milepost 
95 has weakened below severe limits, and no longer poses an 
immediate threat to life or property. Therefore, the warning will be 
allowed to expire.

LAT...LON 3527 11332 3523 11320 3511 11324 3513 11333
      3525 11333
TIME...MOT...LOC 0005Z 049DEG 6KT 3524 11331 

$$

RR

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 5:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	51 min
Jul 10, 5:16 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Coconino, Gila, Navajo	44 min
Jul 10, 5:56 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	49 min
Jul 10, 6:23 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	3 hr
Jul 10, 6:44 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	35 min
Jul 11, 3:22 PM MST	Special Weather Statement	FGZ	Yavapai	23 min
Jul 11, 3:35 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	40 min
Jul 11, 3:49 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	41 min
Jul 11, 4:25 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Jul 11, 4:58 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	11 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.